Method for measuring physical parameter S of soil

A technology of physical parameters and soil, applied in the field of solving performance parameters, can solve the problems of expensive measuring instruments and long measuring period, and shorten the experiment time.

Inactive Publication Date: 2014-12-10
TARIM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the invention is to solve the problem that the measurement of soil physical quality parameter S depends on the soil moisture characteristic curve van Genu...

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  • Method for measuring physical parameter S of soil
  • Method for measuring physical parameter S of soil
  • Method for measuring physical parameter S of soil

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specific Embodiment approach 1

[0020] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the method for measuring soil physical parameter S described in this embodiment, this method comprises the following steps:

[0021] Step 1, pass the air-dried soil sample through a 2mm sieve and divide it into two parts;

[0022] Step 2. Use the first soil sample to measure the saturated water content θ s and field capacity θ fc ;

[0023] Step 3. Use the second soil sample to measure the residual moisture content θ r ;

[0024] Step 4, according to the formula

[0025] n = 1 1 - 56.17 exp [ - 8.141 θ fc - θ r ...

specific Embodiment approach 2

[0040] Specific implementation mode two: This implementation mode provides a specific example, the soil sample adopts sandy soil, and the basic data θ measured by the method of the present invention is applied s =0.2436kgkg -1 ; θ r =0.00kgkg -1 ; θ fc =0.1424kgkg -1 , n=1.929 calculated by the method of the present invention, S=0.0889 obtained by the method of the present invention, S=0.0894 measured by the traditional measurement method, the relative error is 0.56%, and the relative error is very small.

specific Embodiment approach 3

[0041] Specific implementation mode three: This implementation mode provides a specific example, the soil sample adopts loam soil, and the basic data θ measured by the method of the present invention is applied s =0.3646kgkg -1 ; θ r =0.0897kgkg -1 ; θ fc =0.2576kgkg -1 , n=1.6370 calculated by the method of the present invention, S=0.0768 calculated by the method of the present invention, S=0.0777 measured by the traditional measurement method, the relative error is 1.16%, and the relative error is very small.

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Abstract

The invention discloses a method for measuring a physical parameter S of soil, relating to a method for solving a performance parameter, and aiming at solving the problems that measurement instruments are expensive and measurement periods are long as the measurement of the physical mass parameter S of the soil depends on a van Genuchten equation of a water soil water characteristic curve. The method comprises the following steps: step one, sieving an air-dried soil sample by virtue of a 2-mm sieve and dividing the soil sample into two parts; step two, measuring a saturation moisture content theta s and a field moisture capacity theta (fc) by using the first part of the soil sample; step three, measuring a residual moisture content theta r by using the second part of the soil sample; step four, obtaining a parameter n according to a formula as shown in the specification; and step five, obtaining the physical parameter S of the soil according to another formula as shown in the specification.

Description

technical field [0001] The invention relates to a method for solving performance parameters and belongs to the field of soil characteristic research. Background technique [0002] The traditional parameters that indicate the quality of soil physical properties mainly include pore properties, structure, bulk density, water availability, soil moisture characteristic curve, expansion and contraction, clay particle dispersion and other indicators. However, these indicators can only reflect a certain aspect of the physical properties of soil, and cannot fully reflect the comprehensive properties of soil physical properties. The soil physical quality parameter S refers to the slope of the soil moisture characteristic curve at the inflection point. S can not only fully reflect the characteristics of soil in terms of water conduction, tightness, tillability, water availability, mechanical resistance, etc., but also effectively reflect the influence of soil physical properties on th...

Claims

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Application Information

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IPC IPC(8): G01N5/00
Inventor 迟春明
Owner TARIM UNIV
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